L5109:LAPD_DATA
This measurement provides the number of requests that are sent from LAPD Link L3 to L2 and contain the to-be-confirmed messages.
The requests sent from L3 consist of the messages that need or need not be confirmed. The former are transferred in L2 I frames and the latter are transferred in L2 UI frames.
All the L3 messages sent by the BTS except for the MR need be confirmed. If the BTS L2 receives one request containing the to-be-confirmed message from L3, this counter is incremented by 1.
If the physical uplink is disrupted, the measurement result cannot be sent to the BSC, and the value of this counter does not increase.
Integer number or integer.
This counter is measured when the BTS L2 LAPD Link receives the request containing the to-be-confirmed message from L3.
This is an original counter without involving any formula.